Ext.onReady(function() {
			var root = new Ext.tree.TreeNode({
						id : "root",
						text : "树的根"
					});
			root.appendChild(new Ext.tree.TreeNode({
						id : "c1",
						text : "子节点"
					}));
			var tree = new Ext.tree.TreePanel({
						renderTo : "hello",
						root : root,
						width : 100
					});
		});